Cabello, who took home the Billboard Chart Achievement Award at the May 20 ceremony, tweeted very late Monday night (May 21) that she'd been forced to pull out of the Seattle stop at the Reputation World Tour after being hospitalized.

“So yesterday after my performance at the billboards, I was feeling really sick and ended up in the hospital to get checked out,” she wrote. “They ran a lot of tests and everything is fine, but the diagnosis was basically dehydration and I also have a low grade fever — the doctors have told me I really have to get rest otherwise I won’t get better — so unfortunately I won’t be able to perform my set during the Reputation tour in Seattle tomorrow.”

"I'm so sorry to let you guys down and I promise I will make it up as soon as I can!" she added.

And fans eagerly wished her well.

"please take care of yourself, your health and your well-being is more important than anything !! I hope you get well soon my angel," one wrote, while another noted "You have to rest princess, you are giving everything of you!"

Cabello is scheduled to next appear as Swift's opener at the May 25 show in Denver.